RequestBatcher v0.0.2

What's Changed

• Explicit group submissions larger than MaxPendingRequests now work in Wait mode and enter the queue as consecutive capacity-sized slices.
• Fail mode continues to reject a submission as a whole when it cannot be admitted immediately.
• Caller cancellation preserves the real outcome of requests already dispatched to a Handler and cancels requests that have not been dispatched.
• Graceful shutdown drains every submission started before shutdown, including submissions waiting for capacity.
• Partition routing and per-key ordering are preserved across capacity-sized slices.
• Explicit group submissions share completion state to reduce per-request allocations.
• Documentation now distinguishes submissions, Handler batches, partitions, capacity, cancellation, and transaction boundaries more clearly.
• Updated the BufferQueue dependency to 2.0.2.

Full Changelog: v0.0.1...v0.0.2